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【单选题】
What detail in the article shows that the mummies can help Egypt?A.
The mummies were of big cats like lions. There were mummies of cobras and crocodiles, too.
B.
There are mummies of cats, birds and a big bug. The bug is much bigger than normal.
C.
Leaders hope the mummies will get people excited about Egypt. They want people to visit.
D.
She is also a mummy expert. She said Egyptians used to offer things to gods.
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【单选题】某三相异步电动机在额定运行时的转速为1440r/min，电源频率为50HZ，此时转子电流的频率为（ ）。
A.
50H Z
B.
48H Z
C.
2H Z
D.
60H Z
E.
68H Z
F.
20H Z
【单选题】下面是精原细胞进行减数分裂的几个步骤，期中正确的顺序是 ①同源染色体联会 ②同源染色体分离 ③交叉互换 ④染色体复制 ⑤细胞质分裂 [ ]
A.
④③①②⑤
B.
④①③②⑤
C.
④②①③⑤
D.
①④②③⑤
【单选题】某三相异步电动机在额定运行时的转速为 2970 r/min,电源频率为50 Hz,此时转子电流的频率为 ( )
A.
0.1 Hz
B.
0.5 Hz
C.
4.5 Hz
D.
50 Hz
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